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Winchester 5.56 NATO 55-grain FMJ ammunition in a 20-round box, ideal for range training and reliable function in MSRs and AR-pattern rifles.
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Product Description
Winchester 5.56 55 grain FMJ 20-round boxes deliver reliable 5.56 NATO ammunition in a compact package suited for range sessions and zeroing work. This full metal jacket load runs clean in modern sporting rifles and pairs well with carbines and rifles chambered in 5.56 NATO or .223 Remington.
The 55-grain bullet weight is the original military specification for 5.56 NATO and remains the most common training round. FMJ construction feeds smoothly through semi-automatic actions and minimizes fouling compared to exposed-lead projectiles.
Twenty-round boxes fit easily in range bags and let you buy exactly what you need without committing to bulk cases. Whether you are confirming zero after a sight change or working through drills, this format keeps your ammunition budget flexible.
Key Facts
- Caliber: 5.56 NATO
- Bullet Type: FMJ (Full Metal Jacket)
- Grain Weight: 55 Grain
- Rounds per Box: 20
- SKU: WNQ3131L
Why 55 Grain in 5.56 NATO
The 55-grain projectile stabilizes in most 5.56 barrels regardless of twist rate. Faster twist rates like 1:7 or 1:8 handle heavier bullets, but 55-grain rounds run reliably across the entire range of barrel specifications. This makes them a safe choice when you do not know the exact twist rate of your rifle or when feeding multiple firearms with different configurations.
Full metal jacket bullets are designed for target shooting and training. The copper jacket covers the lead core completely at the nose, which improves feeding reliability and reduces lead exposure during high-volume shooting. FMJ loads are not intended for hunting or defensive use, where controlled expansion is required.
20-Round Box Format
Smaller box counts suit shooters who rotate stock frequently or prefer to test multiple loads without buying in bulk. Twenty rounds is enough to zero an optic, confirm point of impact after cleaning, or run a few magazines during a short range trip.
This size also works well when state or local regulations limit the quantity you can transport or when you want to keep weight down in a field bag. For larger orders or regular training schedules, browse our full ammunition selection for case pricing and bulk options.
5.56 NATO vs .223 Remington Chamber Compatibility
Rifles marked 5.56 NATO can safely fire both 5.56 NATO and .223 Remington cartridges. Rifles marked .223 Remington should only fire .223 ammunition, as the 5.56 NATO chamber has different throat dimensions and operates at higher pressure.
Always check your barrel or receiver markings before loading. If the chambering is unclear, call 817-393-4000 and our gunsmiths can help you identify what your rifle is built to handle.
Buying from Western Sport in Roanoke, TX
Western Sport is a licensed FFL/SOT dealer serving North Texas and the DFW area since 2007. We handle transfers, special orders, and full gunsmithing services on site. Call 817-393-4000 to check current availability, place an order, or ask about volume pricing on training ammunition.
Frequently Asked Questions
Q: Will Winchester 5.56 55gr ammo work in my AR-15?
A: Winchester 5.56 55-grain FMJ will function in any AR-15 or modern sporting rifle chambered in 5.56 NATO or .223 Wylde. If your rifle is marked .223 Remington only, confirm with a gunsmith before using 5.56 NATO ammunition. Call 817-393-4000 if you need help identifying your chamber.
Q: How many rounds are in a box of Winchester 5.56 55 grain?
A: This Winchester 5.56 55-grain FMJ SKU contains 20 rounds per box. For case quantities and bulk pricing, contact Western Sport at 817-393-4000 or visit our online shop.
Q: What is the difference between 55 grain and 62 grain 5.56 ammo?
A: The 55-grain bullet is lighter and typically produces higher velocity at the muzzle, while 62-grain bullets retain energy better at distance and may stabilize better in faster-twist barrels. For general training and zeroing, 55-grain FMJ is the most economical and widely used option.
Q: Can I use Winchester 5.56 FMJ for home defense?
A: FMJ ammunition is designed for training and target shooting, not defense. For defensive applications, consider hollow-point or soft-point loads engineered for controlled expansion. Our staff can recommend suitable options when you call 817-393-4000.
Q: Is Winchester 5.56 ammo brass or steel case?
A: Call 817-393-4000 to confirm case material and primer type for this specific SKU. Winchester produces both brass-cased and steel-cased lines, and confirming the details before purchase ensures compatibility with your range rules and firearm.
Q: Do I need an FFL transfer to buy rifle ammunition in Texas?
A: Rifle ammunition sales in Texas do not require an FFL transfer, but you must be at least 18 years old and provide valid identification. Western Sport handles compliance for all purchases. Call 817-393-4000 with questions about Texas ammunition regulations or to place an order.
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